That engine is definitely not original. Chrysler didn't come out with the hemi until the mid 50's.
Well see, thats what I ain't sure of. Chrysler; and others, 1st started horsing around with "hemi-head" combustion chambers darn near a 100 years ago. I believe 1st time it was in an automobile was early 50's. Unsure of any "hemi" production power before that.-JRC
Could be they were experimenting with the head design prior to the 50's , but the V-8 hemi came out then. The valve covers in the pic are identical to the ones on a friend's two 50's vintage hemis sitting in his garage.